Synthesis and biological evaluation of 2-(5-methyl-4-phenyl-2-oxopyrrolidin-1-yl)-acetamide stereoisomers as novel positive allosteric modulators of sigma-1 receptor
作者:Grigory Veinberg、Maxim Vorona、Liga Zvejniece、Reinis Vilskersts、Edijs Vavers、Edvards Liepinsh、Helena Kazoka、Sergey Belyakov、Anatoly Mishnev、Jevgenijs Kuznecovs、Sergejs Vikainis、Natalja Orlova、Anton Lebedev、Yuri Ponomaryov、Maija Dambrova
DOI:10.1016/j.bmc.2013.03.016
日期:2013.5
Novel positive allosteric modulators of sigma-1 receptor represented by 2-(5-methyl-4-phenyl-2-oxopyrrolidin-l-yl)-acetamide enantiomers were synthesised using an asymmetric Michael addition of 2-nitroprop-1-enylbenzene to diethyl malonate. Following the chromatographic separation of the methyl erythro- and threo-4-nitro-3R- and 3S-phenylpentanoate diastereoisomers, target compounds were obtained by their reductive cyclisation into 5-methyl-4-phenylpyrrolidin-2-one enantiomers and the attachment of the acetamide group to the heterocyclic nitrogen. Experiments with electrically stimulated rat vas deference contractions induced by the PRE-084, an agonist of sigma-1 receptor, showed that (4R,5S)- and (4R,5R)-2-(5-methyl-4-phenyl-2-oxopyrrolidin-l-yl)-acetamides with an R-configuration at the C-4 chiral centre in the 2-pyrrolidone ring were more effective positive allosteric modulators of sigma-1 receptor than were their optical antipodes. (C) 2013 Elsevier Ltd. All rights reserved.